The number of peer entities of comparable size and industry to estimate volatility.

No definition available.

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- Definition

Change in expected term of share-based compensation awards using the simplified method in accordance with GAAP, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Weighted average remaining contractual term for option granted, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Number of share options (or share units) vested during the current period.

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

Weighted average exercise price of vested options during the current period.

+ References

No definition available.

+ Details

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- Definition

Decrease in share based compensation expense due to change in expected term.

+ References

No definition available.

+ Details

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- Definition

Increase in share based compensation expense due to change in expected term.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

+ Details

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

+ Details

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- Definition

The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

No definition available.

+ Details

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- Definition

The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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Period Type:	duration

- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

+ Details

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Period Type:	duration

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Data Type:	xbrli:sharesItemType
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

+ References

+ Details

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Period Type:	instant

- Definition

As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

+ References

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of vesting of share-based compensation awards.

+ References

+ Details

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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- Definition

Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Equity and Share-Based Compensation - Stock Options (Details) $ / shares in Units, $ in Thousands				2 Months Ended		3 Months Ended		12 Months Ended
	Nov. 01, 2017	Oct. 21, 2017 shares	Oct. 21, 2016 $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2016 $ / shares shares	Dec. 31, 2017 USD ($) item $ / shares shares	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) item $ / shares shares
Additional information
Share-based compensation costs recognized \| $				$ 2,909				$ 9,196
Capitalized qualifying share-based compensation costs to oil and gas properties \| $				$ 637				$ 1,995
Stock Options
Weighted average assumptions used to estimate fair value of stock option awards
Risk-free interest rate (as a percent)				1.38%				2.11%
Expected option life (in years)				5 years 11 months 16 days				5 years 11 months 16 days
Expected volatility (as a percent)				60.00%				65.00%
Calculated fair value per stock option (in dollars per share)				$ 10.88	$ 10.88	$ 11.43		$ 11.43
Change in expected option life (in years)								2 years
Increase in expense due to change in expected term \| $				$ 100				$ 900
Decrease in expense due to change in expected term \| $				$ (200)				$ (1,100)
Number of peer companies to estimate volatility \| item						6		6
Expected volatility rate, minimum (as a percent)				38.50%				36.90%
Expected volatility rate, maximum (as a percent)				65.90%				68.20%
Additional information
Capitalized qualifying share-based compensation costs to oil and gas properties \| $				$ 200				$ 700
Minimum
Weighted Average Exercise Price
Vested and exercisable at end of period (in dollars per share)						$ 19.08		$ 19.08
Maximum
Share-Based Compensation
Percentage of awards vesting on each anniversary of the grant	120.00%
Weighted Average Exercise Price
Vested and exercisable at end of period (in dollars per share)						$ 20.97		$ 20.97
2016 LTIP
Weighted Average Remaining Contractual Term (Years)
Vested and exercisable options, aggregate intrinsic value \| $						$ 0		$ 0
2016 LTIP \| Stock Options
Share-Based Compensation
Vesting period								3 years
Expiration period (in years)								10 years
Options
Stock options outstanding at beginning of period (in shares) \| shares					628,468			627,806
Granted (in shares) \| shares					2,035			4,000
Vested (in shares) \| shares				0
Forfeited (in shares) \| shares					(2,697)			(132,283)
Stock options outstanding at end of period (in shares) \| shares			628,468	627,806	627,806	245,845		245,845
Vested and exercisable at end of period (in shares) \| shares						253,678		253,678
Weighted Average Exercise Price
Stock options outstanding at beginning of period (in dollars per share)					$ 19.66			$ 19.66
Granted (in dollars per share)					20.97			19.08
Forfeited (in dollars per share)					19.66			19.66
Stock options outstanding at end of period (in dollars per share)			$ 19.66	$ 19.66	$ 19.66	$ 19.66		19.66
Vested and exercisable at end of period (in dollars per share)						$ 19.66		$ 19.66
Weighted Average Remaining Contractual Term (Years)
Granted (in years)					8 years 10 months 24 days			9 years 2 months 12 days
Stock options outstanding at end of period (in years)			8 years 9 months 18 days		8 years 9 months 18 days			8 years 10 months 24 days
Vested and exercisable at end of period (in years)								8 years 9 months 18 days
Additional information
Vested (in shares) \| shares				0
Unrecognized expense for share-based compensation \| $						$ 1,300		$ 1,300
Weighted-average period for over which unrecognized expense will be recognized								1 year 3 months 18 days
2016 LTIP \| Stock Options \| $19.08-20.97
Options
Vested (in shares) \| shares		(109,820)						(253,678)
Exercise price (Lower limit)								$ 19.08
Exercise price (Upper limit)								20.97
Weighted Average Exercise Price
Weighted average vested price of vested options (in dollars per share)								$ 19.66
Additional information
Vested (in shares) \| shares		109,820						253,678
Awards vesting on the six-month anniversary of the Effective Date \| 2016 LTIP \| Stock Options
Share-Based Compensation
Percentage of awards vesting on each anniversary of the grant								16.67%
Awards vesting on the twelve-month anniversary of the Effective Date \| 2016 LTIP \| Stock Options
Share-Based Compensation
Percentage of awards vesting on each anniversary of the grant								16.67%
Awards vesting on the twenty four-month anniversary of the Effective Date \| 2016 LTIP \| Stock Options
Share-Based Compensation
Percentage of awards vesting on each anniversary of the grant								33.33%
Awards vesting on the thirty six-month anniversary of the Effective Date \| 2016 LTIP \| Stock Options
Share-Based Compensation
Percentage of awards vesting on each anniversary of the grant								33.33%
General and administrative expense \| Stock Options
Additional information
Share-based compensation costs recognized \| $				$ 800				$ 2,600
Mr. Brace (Former President and CEO) \| Stock Options
Additional information
Accelerated compensation expense \| $						$ 700	$ 700